Meaning of “coast” - Learner’s Dictionary

coast

noun [ C, U ] us uk /kəʊst/

B1 the land beside the sea:

The island lies off the North African coast (= in the sea near North Africa).
They live on the east coast of Scotland.

More examples

coast to coast

from one side of a country to the other

(Definition of “coast noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)